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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '193b0d8aac1346b9c8d75af06b136e405cf5632fc061b2ff776a15533b8b52a8' 
  AND token = 'YTbDcu0AVMYNX9TMKXkn6UKhW6RIaoOXwULsbZf4G2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}